求翻译：张启卫等[1] 以软锰矿和硫铁矿为原料, 经硫酸浸取除杂后制得纯净硫酸锰溶液, 再经碳酸氢铵和氨水中和制得碳酸锰, 将碳酸锰进行热分解可得纯度>90%的二氧化锰。是什么意思？

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Zhang Wei, [ 1] to soft manganese and sulfur iron ore raw material, the sulfuric acid flooding after the addition of a pure sulfuric acid solution, and the manganese carbonate and ammonium in ammonia and a manganese, manganese for thermal decomposition will be purity >90% of the manganese oxide 2

(1) and so on Zhang Qiwei take the pyrolusite and the pyrite as the raw material, takes after the sulfur acid pickling after mixed makes the pure manganese sulfate solution, again passes through the ammonium bicarbonate and the ammonia water neutral system results in the manganese carbonate, carries

Zhang Qiwei, [1] with sulfur soft manganese ore and iron ore as raw materials, after sulfuric acid leaching of impurity is pure manganese sulfate solution, Ammonium bicarbonate and ammonia and manganese carbonate, purity manganese carbonate thermal decomposition of >90% manganese dioxide.

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